Your basic scuba masks consist of a silicon seal that acts as a suction on your face preventing water from entering. What are the MOST IMPORTANT things look for in buying a scuba mask or snorkeling mask? The mask is a long term investment. With the right maintenance and care, it can last a long time. Quality We are not talking about cheap mask that you buy for $10.00 that will continually leak on you. A good quality mask will run anywhere from $40.00 to $150.00 depending if there are any .